Question 38 QMED04 - Boiler Technician-Watertender

The Correct Answer is D **Explanation for Option D (both A and C are correct):** The terms rough, coarse, bastard, second cut, smooth, and dead smooth are universally recognized classifications used in the context of files. They refer specifically to the **coarseness (or grade)** of the file teeth (Option C). The coarseness of the teeth is determined by the **pitch** of the teeth—that is, the distance between the parallel cuts (lines of teeth) on the file face (Option A). * A **rough** file has the greatest distance between cuts (largest pitch), resulting in very coarse teeth. * A **smooth** or **dead smooth** file has the smallest distance between cuts (smallest pitch), resulting in very fine teeth. * Therefore, since the coarseness (C) is directly defined and quantified by the distance between the cuts (A), both statements accurately describe what the grading terms (rough, bastard, smooth, etc.) refer to. **Explanation for Incorrect Options:** * **A) distance between the parallel cuts of a file:** This is partially correct, as the distance between the cuts defines the grade. However, it is incomplete because the terms are fundamentally describing the resulting **coarseness** of the tool, which is covered in C. Since both A and C are correct and D combines them, A alone is not the best answer. * **B) size of the file:** The size of the file is typically measured by its length (e.g., a 10-inch file). While files of different sizes can have these grades, the terms themselves (rough, smooth, etc.) do not refer to the physical length or overall dimensions of the file; they refer specifically to the tooth pattern/grade. * **C) coarseness of file teeth:** This is partially correct. The terms *are* the names given to the various grades of coarseness. However, the coarseness is quantified by the distance between the cuts (A). Since the distance (A) defines the coarseness (C), and D includes both A and C, C alone is not the most comprehensive answer.